Physics Light Behavior Quiz
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Questions and Answers

What is the term for light being turned back into the first medium when it encounters a second medium?

  • Reflection (correct)
  • Refraction
  • Diffusion
  • Transmission

Which characteristic of light indicates that it can travel through space without needing a medium?

  • Light is an electromagnetic wave
  • Light has a dual nature
  • Light reflects from surfaces
  • Light does not require a material medium for propagation (correct)

When light travels from air into glass, what happens to its speed?

  • It remains the same as in air
  • It stops completely
  • It decreases considerably (correct)
  • It increases significantly

What type of beam of light is formed when the rays are parallel to each other?

<p>Parallel Beam (B)</p> Signup and view all the answers

What is the correct definition of a ray of light?

<p>A path along which light energy travels (C)</p> Signup and view all the answers

Which of the following is NOT true about the behavior of light at the interface of two media?

<p>Light can only be refracted (B)</p> Signup and view all the answers

A collection of a very small number of light rays is referred to as what?

<p>Pencil of Light (A)</p> Signup and view all the answers

What type of beam of light occurs when the rays spread out from a point?

<p>Diverging Beam (C)</p> Signup and view all the answers

What is the sign of magnification for a virtual image?

<p>Positive (D)</p> Signup and view all the answers

In longitudinal magnification, what does the negative sign represent?

<p>Inversion of the image (A)</p> Signup and view all the answers

How is the velocity of the image determined for an object moving along the principal axis?

<p>By the velocity of the object relative to the mirror (C)</p> Signup and view all the answers

What is the formula represented by Newton's formula in terms of object and image distances?

<p>$xy = f^2$ (D)</p> Signup and view all the answers

What indicates that a real image has a negative magnification?

<p>It is inverted (D)</p> Signup and view all the answers

In the case of longitudinal magnification, what does 'du' represent?

<p>Size of the object (A)</p> Signup and view all the answers

What formula can be used to calculate the velocity of an image for an object moving perpendicular to the principal axis?

<p>$h_2 - v = (h_1)(u)$ (A)</p> Signup and view all the answers

What happens to the image magnitude when the object is doubled in size along the principal axis?

<p>Image size becomes larger (D)</p> Signup and view all the answers

What are marginal rays?

<p>Rays that travel parallel and far from the principal axis (C)</p> Signup and view all the answers

What does spherical aberration refer to?

<p>Inability of a spherical mirror to focus all rays to the same point (A)</p> Signup and view all the answers

If two plane mirrors are inclined at 60 degrees, how many images are formed when an object is placed between them?

<p>5 (A)</p> Signup and view all the answers

How can one distinguish between a concave mirror and a convex mirror without touching them?

<p>By bringing the face close to each mirror and observing the image (D)</p> Signup and view all the answers

If the sun subtends an angle θ radians at the pole of a concave mirror, how is the diameter of the sun's image calculated?

<p>Using the formula x = f tan θ (A)</p> Signup and view all the answers

What type of image does a concave mirror produce for a distant object like the sun?

<p>Real, inverted, and diminished (A)</p> Signup and view all the answers

What is the relationship between the height of an object and the height of its image in a concave mirror when the object is placed perpendicular to the principal axis?

<p>The height of the image can be larger or smaller depending on the focal length (B)</p> Signup and view all the answers

Why can spherical aberration be eliminated by using a paraboloid mirror?

<p>It focuses all rays to a single point regardless of their angle (C)</p> Signup and view all the answers

How does the density of a medium affect the speed of light?

<p>The speed of light decreases with higher density. (D)</p> Signup and view all the answers

What happens to light when it passes from a denser medium to a rarer medium beyond the critical angle?

<p>It undergoes total internal reflection. (C)</p> Signup and view all the answers

Which color of light has the highest refractive index in a medium?

<p>Violet (B)</p> Signup and view all the answers

What is the result of multiplying the refractive indices of three different media?

<p>It equals 1. (B)</p> Signup and view all the answers

What is defined as the critical angle in optics?

<p>The angle at which refracted light travels along the interface. (D)</p> Signup and view all the answers

In the formula $a \mu w \times w \mu g \times g \mu a = 1$, which term represents the refractive index from medium A to medium W?

<p>aµw (B)</p> Signup and view all the answers

What is the effect of a higher refractive index on the behavior of light?

<p>It causes a greater bending of light. (C)</p> Signup and view all the answers

If two media have refractive indices related as $\frac{1}{\mu_3} = \frac{1}{\mu_2}$, what does this imply?

<p>Media 2 and 3 have equal refractive indices. (C)</p> Signup and view all the answers

What device is used to convert electrical signals into light for transmission through optical fibres?

<p>Transducer (D)</p> Signup and view all the answers

When light travels through glass with a refractive index of 1.5, what is the speed of light in that medium?

<p>$2 imes 10^8$ m/s (D)</p> Signup and view all the answers

If the frequency of light waves is $6 imes 10^{14}$ Hz, what is the wavelength of light in air?

<p>$5 imes 10^{-7}$ m (B)</p> Signup and view all the answers

What effect does the refractive index have on the path of light when passing from air to glass?

<p>Light slows down (A)</p> Signup and view all the answers

What is the relationship used to calculate the speed of light in a medium with a given refractive index?

<p>$v = c / ext{R.I.}$ (C)</p> Signup and view all the answers

How much does a bottom of a water tank appear to be raised if the actual depth is 4 m and the refractive index of water is $3/4$?

<p>2.67 m (B)</p> Signup and view all the answers

What phenomenon enables optical fibres to transmit light over long distances?

<p>Reflection (A)</p> Signup and view all the answers

Which of the following is NOT a correct effect of light passing from air into a denser medium like glass?

<p>Increase in frequency (B)</p> Signup and view all the answers

What is the power of a concave lens?

<p>Negative (C)</p> Signup and view all the answers

Which of the following correctly describes the position of the image formed by a concave lens when the object is between the lens and its focal point?

<p>Virtual and erect (A)</p> Signup and view all the answers

What is the formula to calculate the power of a lens?

<p>Power (P) = 1/f (in m) (B)</p> Signup and view all the answers

How does the power of a lens combine when two thin lenses are placed in contact?

<p>Power is the algebraic sum of the powers of the lenses (D)</p> Signup and view all the answers

When the object is positioned at infinity relative to a lens, the nature of the image formed is:

<p>Virtual and erect (A)</p> Signup and view all the answers

What is the relationship represented by the lens formula 1/f = 1/v + 1/u?

<p>It defines the relationship between object distance, image distance, and power (C)</p> Signup and view all the answers

Which of the following best describes the size of the image formed when the object is at infinity?

<p>Highly diminished (B)</p> Signup and view all the answers

If the focal length of a lens is -0.5m, what is its power?

<p>-2 D (D)</p> Signup and view all the answers

Flashcards

Reflection of Light

When light bounces off a surface back into the medium it came from.

Refraction of Light

When light bends as it passes from one medium to another.

Absorption of Light

When light energy is taken in by a medium.

Ray of Light

The path light travels in a straight line.

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Beam of Light

A collection of light rays.

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Parallel Beam

Light rays traveling in the same direction.

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Converging Beam

Light rays coming together at a point.

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Diverging Beam

Light rays spreading out from a point.

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Paraxial Rays

Rays of light near the pole of a mirror that make small angles with the principal axis.

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Marginal Rays

Rays of light that are parallel but far from the principal axis of a mirror.

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Spherical Aberration

The inability of a spherical mirror to focus all rays of a beam of light to a single point.

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Number of Images (Plane Mirrors)

Calculated by: n = 360/θ, where n is the number of images and θ is the angle between mirrors in degrees. Number of images = n-1.

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Image of Sun at a Concave Mirror Focal Length

The image of a distant object (like the sun) through a concave mirror is formed at the focal point and is real, inverted, and diminished.

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Calculating Image Diameter

The diameter of the image (x) is related to the focal length (f) and the angle θ (in radians), the sun subtends subtends at the mirror, by the formula: x = fθ.

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Object Height

The Height of the image form = (Image distance / Object distance) x object height

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Distinguishing Mirrors

By looking at the image produced without touching them, you can tell the type of mirror. Plane, convex and concave produce different images.

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Longitudinal Magnification

Ratio of change in image size (dv) to change in object size (du) along the principal axis of a mirror.

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Longitudinal Magnification Formula (Small Object)

dv/du = v²/u²

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Longitudinal Magnification Formula (Large Object)

v2-v1/u2-u1 (always negative)

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Magnification (m)

Ratio of image height (h2) to object height (h1).

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Velocity of Image (Perpendicular to Principal Axis)

Velocity of image = -v/u * Velocity of object (w.r.t. mirror, along y-axis)

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Velocity of Image (Along Principal Axis)

dv/dt = v^2/u^2 * du/dt (w.r.t mirror, along x-axis)

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Newton's Formula

xy = f²

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Virtual Image Magnification

Positive magnification; Image is upright

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What does denser medium mean for light speed?

The denser the medium, the slower the speed of light.

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What is the refractive index?

The refractive index is a measure of how much light bends when it passes from one medium to another. It depends on the medium's nature, its physical conditions, and the color of light.

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How does light color affect refractive index?

Violet light bends more than red light, meaning it has a higher refractive index.

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How to find the refractive index between two media?

To find the refractive index between two media, you can find the product of their refractive indices with respect to air.

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Total Internal Reflection

When a ray of light travels from a denser to a rarer medium at an angle greater than the critical angle, it reflects back into the denser medium.

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What happens to the refracted ray as the angle of incidence increases?

As the angle of incidence increases, the refracted ray bends more towards the interface. At a particular angle, the refracted ray travels along the interface, achieving a 90 degree angle of refraction.

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What is the critical angle?

The critical angle is the specific angle of incidence for which the refracted ray travels along the interface and the angle of refraction is 90 degrees.

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Why does light travel along the interface at the critical angle?

At the critical angle, the refracted ray becomes parallel to the interface, effectively trapped within the denser medium.

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Optical Fiber Transmission

A method of transmitting electrical signals by converting them into light signals using transducers, sending the light through optical fibers, and then converting back to electrical signals at the destination.

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Transducers

Devices that convert one form of energy into another, specifically used in optical fiber transmission to convert electrical signals into light and vice-versa.

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Refractive Index

A measure of how much light bends when passing from one medium to another. Higher refractive index means more bending.

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Spherical Refracting Surface

A curved surface that refracts light, often used in lenses and mirrors. It's a portion of a sphere's surface.

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Speed of Light in Mediums

The speed of light is different in different materials due to their refractive index. Higher RI means slower speed.

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Wavelength of Light

The distance between two consecutive crests or troughs of a light wave. It changes when light passes from one medium to another.

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Apparent Depth

The perceived depth of an object when viewed through a refractive medium, which is shallower than the actual depth.

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Lens Power

The strength of a lens, measured as the reciprocal of its focal length in meters. Units: Diopters (D).

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Convex Lens Power

The power of a convex lens is positive because its focal length is positive.

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Concave Lens Power

The power of a concave lens is negative because its focal length is negative.

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Combined Lens Power

When two thin lenses are placed in contact, the total power is the sum of their individual powers.

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Lens Formula

A relationship between object distance (u), image distance (v) and focal length (f) of a lens.

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Object at Infinity

The image formed by a lens when the object is very far away is located at the focal point.

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Object between O and ∞

The image formed by a lens when the object is between the lens and infinity is virtual, erect, and diminished.

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Object between O and F

The image formed by a lens when the object is between the lens and its focal point is virtual, erect, and magnified.

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Description

Test your knowledge on the behavior of light as it interacts with different media. This quiz covers topics such as reflection, refraction, magnification, and the characteristics of light beams. Enhance your understanding of light's properties and principles in physics.

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